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Restraint Straps (Domestic Roofs)
Gable Restraint System
Timber Gable to Masonry fixing detail to cold roofs – Continuous Wallplate Class 1 Buildings/houses of single occupancy three storeys or less England & Wales and two storeys or less Scotland
Gable Panel
225mm maximum height between underside of wallplate and horizontal restraint strap
Insulation continued into gable panel
Breather membrane to face of gable panel
Roof insulation
Cullen FT Timber frame wall ties Continuous wallplate 38mm min-75mm maximum depth
Longitudinal truss bracing
Level of truss wallplate
Solid blocking between truss and gable panel at horizontal restraint strap positions Gable panel to wallplate fixing - Paslode 3.1mm dia x min 75mm long smooth shank nails at maximum 175mm centres Vertical holding down strap plugged and screwed to blockwork
Mortar bed
Cullen RST-3 restraint straps at maximum 1200mm centre fixed to longitudinal truss bracing /
Cullen Gable Restraint Bracket (GRB) at maximum 1200mm centres
additional longitudinal bracing with 8 no. 4 x 25mm steel screws fixed to gable panel stud with 3 no. 3.4 x 35 mm square twist nails
Cavity insulation shown for indicative purposes only - thermal bridging and SAP calculations are plot specific Cavity trays and firestops to be detailed by building designer
at maximum 1.8m centres, Cullen VRS-900-100 strap
Details for a raised wall plate & Class 2A buildings can be found in our Gable Restraint System Technical Guide . https://online.flippingbook.com/view/228839799/ Please contact our Technical department if you require further information.
The latest most up to date version will always be online and not in print or in downloaded pdf.
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Technical support 01592 771132 / technical@itwcp.com / https://www.itwcp-offsite.co.uk
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